Papermaking machine rectifier roll



Sept. 4, 1951 E. D. BEACHLER PAPERMAKING MACHINE RECTIFIER ROLL FiledJune 27, 1946 I N VEN TOR. [Err/920 fl 63996; [E

T 0 o o c U Q Q Q U 0 l I Ams.

Patented Sept. 4, 1951 PAPERMAKING MACHINE RECTIFIER ROLL Edward D.Beachler, Beloit, Wls., assignor to Beloit Iron Works, Beloit, Wis., acorporation of Wisconsin Application June 27, 1946, Serial No. 679,843

4 Claims. 1

This invention relates to a perforated or foraminous roll constructionfree from burs and sharp corners and produced without the aid ofexpensive finishing operations. Specifically the invention deals with apaper machine rectifier roll construction and a method of makingrectifier rolls wherein a perforated tube has axle supporting disks tackwelded therein at the points where they cross the perforations andwherein all burns, sharp corners. and the like, are covered with smoothrubber fillets obtained by dipping the entire fabricated assembly inrubber latex or the like.

Heretofore rectifier rolls were equipped with expensive end headconstructions for carrying the roll supporting axles. If baifies weredesired in the roll between the end heads, the same were secured to thetubular portions of the roll by means of pins or the like. In such priorknown rectifier roll constructions the holes were carefully reamed andsmoothed off to eliminate burs and sharp corners. Such finishingoperations were time consuming'and expensive.

The present invention now provides a rectifier roll construction freefrom the heretofore used end heads. The roll of this invention includesa metal tube having perforations around the entire periphery thereof andalong the entire length thereof. A plurality of metal disks traverse theinterior of the tube in spaced parallel relation. The outermost disksare spaced inwardly from the ends of the tube and the axles are carriedby these outermost disks. The disks bridge some of the holes in the tubeand are tack welded to the tube at these points. The tube with the diskswelded therein is then subjected to a plurality of successive latexdipping and vulcanizing operations until a coating of rubber ofpredetermined thickness covers every bit of exposed metal surface. Therubber coating forms smooth fillets around all sharp corners and coversany irregular or sharp burs that might be present on the metal parts.The rubber cover eliminates the necessity for finishing operations andmaterially lessens the cost of the roll. Since the tube is perforated,the interior of the roll is rubber coated with the exterior. The walldefining each hole in the roll is likewise covered with a rubber layerand therefore each hole has a smooth periphery. As a result of thisconstruction pockets capable of collecting filling material, such asclay or the like. in the paper stock in which the roll operates, areeliminated.

It is then an object of this invention to provide an inexpensiveperforated roll construction mitable for use in paper making machineryto operate in paper stock.

A further object of the invention is to provide a paper machinerectifier roll construction without the necessity for expensive metalfinishing operations.

A still further object of the invention is to decrease the productioncost of paper machine rectifier rolls.

Another object of the invention is to provide a rubber or plasticcovered metal rectifier roll for paper making machinery. -I

A still further object of the invention is to provide a rollconstruction composed of a perforated tube and having disks traversingthe interior of the tube and bridging some of the holes therein.together with tack weld bonds at said hole areas for uniting the disksand tube.

Other and further objects of the invention will the holes of the roll ofFig. 1 and illustrating the construction at this point before the sameis covered with rubber.

Figure 3 is a transverse cross sectional view. with parts in elevation,taken along the line III-III of Fig. 2.

Figure 4 is an enlarged fragmentary longitudinal cross sectional viewtaken along the line IV-IV of Fig. 1.

Figure 5 is a transverse cross sectional view taken along the line V-Vof Fig. 4.

As shown on the drawings:

The rectifier roll Ill shown in Fig. 1 is composed of a perforated metaltube H. a plurality of transverse metal disks I! in the tube II and rollsupporting axles it carried at the axial center of the tube andprojecting from the ends thereof. The outermost metal disks I! arespaced inwardly from the end edges of the tube and several of theoutermost disks have the inner ends of the axles I! aflixed thereto asby welding or the like. Thus each outermost disk I! can have an aperturethrough its axial center receiving the axle therethrough. The inner endof the axle can then be bottomed on the next adjacent an: and the axle nthen welded to both can in the tube to bridge all of the holes of onering as shown. It will be understood, however, 'that this radial ringarrangement of holes is not necessary since the tube has a sufficientnumber of apertures so that a disk -traversing the interior of the tubewould bridge a number of the apertures.

The disks ii are in spaced parallel relation and provide baiiles whichdefine in the tube isolated parallel fiow paths. Since in a rectifierroll construction paper stock must flow through the roll, these isolatedpaths in the roll will stop transverse stock currents.-

As shown in Figs. 2 and 3, the disks l2 fit rather snugly in the tube Hand bisect some of the holes I. Portions of the periphery of the disks1! are thus exposed in the holes ll.

According to this invention as shown in Figures 1, 2, and 4 the disks Hare thinner than the diameter of the holes I and are integrally affixedto the tube II by tack welds l6 (Figures 2, 3, and 5) at the areas wherethe periphery of the disk emerges from covered relation by the tube.Thus the peripheral margin of the disk is tack welded to the tube at.twoareas in each hole bridged or bisected by the disk. These weld bondsI6 are conveniently made through the holes ll since a welding tool canbe operated through the hole M to extend the bond around the peripheralmargin of the disk as shown in Fig. 2 and also under the peripheralmargin of the hole It as shown in Fig. 3. The tack weld bonds l3therefore do not materially restrict the holes it.

Since the tube and disks may have relatively sharp unfinished edges andsince the tack weld bonds l6 may contain irregular surfaces and burlikeedges. according to this invention, a smooth roll construction isobtained by merely dipping the entire welded assembly into a latex bathto deposit a skin of latex thereon. This skin is then vulcanized and thedipping and vulcanizin operations are repeated until a coating of thedesired thickness is built up on all metal surfaces of the roll. A filmof about .008 inch in thickness is obtainable for each dip and thedipping and vulcanizing operations are repeated until a coating of about1 of an inch in thickness is obtained. Instead of rubber latex, otherplastic compositions may be used with the same results.

As illustrated in Figs. 4 and 5, a rubber coating I1 covers all of themetal surfaces including the inner and outer faces of the tube II, thewalls defining the holes I, both faces of the disks I2, theexposedperipheral portions of the isks l2, and the weld bonds 5. This coatingl'l upon vulcanization or drying draws around all sharp corners to formrounded filleted edges such as i'la. These edges will not retain clays,fibers, or the like, in the stock flowing through the roll during itsuse in a paper making machine. As a result of this construction therolls are easily kept in clean condition.

From the above description it should be understood that this inventionprovides an efiiciently operating inexpensive rectifier roll con-.

struction wherein heretofore necessary finish machining operations areeliminated. The roll of this invention is coated with rubber, plastic.or the like, non-corrodible material. The metal parts of the roll cantherefore be composed of inexpensive base metal. The metal parts neednot have accurate interfltting relation since the rubber or plasticcoating will fill out all voids and cover all irregular surfaces. Stocksor'filler material retaining pockets are entirely eliminated.

It will, of course, be understood that various details of constructionmay be varied through a wide range without departing from the principlesof this invention and it is, therefore, not the purpose to limit thepatent granted hereon otherwise than necessitated by the scope of theappended claims.

I claim as my invention:

1. A paper-making machine rectifier roll comprising a perforated metaltube, a plurality of transverse metal disks in spaced parallel relationin said tube. said disks having peripheral portions bridging some of theperforations in the tube, said portions having thickness less than thediameter of the perforations, weld bonds uniting the disks and tube atthe areas where the peripheries of the disks emerge from a covered relation by the tube in the perforations of the tube without closing theperforations, and a non-corrosive plastic material covering and bondedto said tube, disks and weld bonds and having sine-0th fillet portionscovering all sharp edges and irregular metal surfaces.

2. A rectifier roll for paper making machinery which comprises a metaltube, a plurality of metal disks in said tube normal to the axis of thetube, said tube having holes around the periphery thereof of largerdiameter than the thickness of the disks for exposing portions of theperiphery of said disks, localized weld bonds in said holes ailixing thedisks to the tube without closing the holes, and a coating ofnon-corrodible plastic material integrally bonded to all exposed metalsurfaces, said coating forming smooth fillets over all sharp corners andirregular metal surfaces.

3. A paper-making machine rectifier roll comprising a metal tube, saidtube having holes therethrough extending completely around the peripherythereof and along the entire length thereof, a plurality of relativelythin metal disks traversing the interior of said tube in spaced parallelrelation, the outermost disks being spaced inwardly from the end edgesof the tube, each of said disks having exposed peripheral and side faceportions in a plurality of holes in the tube, localized weld bondsuniting said exposed peripheral portions to the tube without closing theholes, axles projecting into the ends of the tube and anchored in theoutermost disks, and a non-corrodible plastic coating covering allexposed surfaces of the metal tube, the metal disks and the weld bonds,said coating being sufficiently thick to form smooth fillets coveringall sharp corners and irregular metal surfaces.

4. A paper making machine rectifier roll comprising a cylindrical metaltube having open ends, said tube having surface perforations formed by aplurality of axially spaced peripherally aligned series of apertures,the tube having scalloped open edges formed by those apertures adjacentthe edges, circular metal disks in said tube inwardly from the scallopededges' tures open to facilitate rectifying action of the roll.

EDWARD D. BEACHLER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 319,615 Plume June 9, 1885527,708 McCorkindale Oct. 16, 1894 1,323,621 Edwards Dec. 2, 19191,367,406 McLean Feb. 1, 1921 1,526,193 Volth Feb. 10, 1925 Number NameDate 1,543,382 Harris June 23, 1925 1,629,088 Aldrich May 17, 19271,648,626 Smith Nov. 8, 1927 1,957,963 Johnstone May 8, 1934 1,960,042Andrus May 22, 1934 2,185,999 Johnson Jan. 9, 1940 2,367,796 PetersonJan. 23, 1945 2,390,977 Williams Dec. 11, 1945 2,440,727 Rosmait May 4,1948 FOREIGN PATENTS Number Country 'Date 426,576 France Feb. 25, 1941OTHER REFERENCES The Flow Spreader, S. M. Bratton and F. M. Sanger,Figure 7, pp. 1062-1066, Paper Industry and Paper World, January 1943.

Use of Rubberized Equipment for Resistance of Corrosion," J. F. Amlicke,Technical Association Paper, Series XXIV, pp. 249 and 250 (1941).

